diff options
| author | Mark Salyzyn <salyzyn@google.com> | 2016-08-31 08:09:04 -0700 |
|---|---|---|
| committer | Mark Salyzyn <salyzyn@google.com> | 2016-09-08 14:16:55 -0700 |
| commit | a38338f1cd595f6a66870ba46cc6a4ae7378c084 (patch) | |
| tree | 6c041969369776e17e07015d7c0be71e790bf984 /include/linux | |
| parent | 92e04f8a13a8bb56a7544e56978663dc2e4f82cc (diff) | |
FROMLIST: pstore: drop pmsg bounce buffer
(from https://lkml.org/lkml/2016/9/1/428)
(cherry pick from android-3.10 commit b58133100b38f2bf83cad2d7097417a3a196ed0b)
Removing a bounce buffer copy operation in the pmsg driver path is
always better. We also gain in overall performance by not requesting
a vmalloc on every write as this can cause precious RT tasks, such
as user facing media operation, to stall while memory is being
reclaimed. Added a write_buf_user to the pstore functions, a backup
platform write_buf_user that uses the small buffer that is part of
the instance, and implemented a ramoops write_buf_user that only
supports PSTORE_TYPE_PMSG.
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 31057326
Change-Id: I4cdee1cd31467aa3e6c605bce2fbd4de5b0f8caa
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pstore.h | 11 | ||||
| -rw-r--r-- | include/linux/pstore_ram.h | 7 |
2 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/pstore.h b/include/linux/pstore.h index 831479f8df8f..5cae2c6c90ad 100644 --- a/include/linux/pstore.h +++ b/include/linux/pstore.h @@ -22,12 +22,13 @@ #ifndef _LINUX_PSTORE_H #define _LINUX_PSTORE_H -#include <linux/time.h> +#include <linux/compiler.h> +#include <linux/errno.h> #include <linux/kmsg_dump.h> #include <linux/mutex.h> -#include <linux/types.h> #include <linux/spinlock.h> -#include <linux/errno.h> +#include <linux/time.h> +#include <linux/types.h> /* types */ enum pstore_type_id { @@ -67,6 +68,10 @@ struct pstore_info { enum kmsg_dump_reason reason, u64 *id, unsigned int part, const char *buf, bool compressed, size_t size, struct pstore_info *psi); + int (*write_buf_user)(enum pstore_type_id type, + enum kmsg_dump_reason reason, u64 *id, + unsigned int part, const char __user *buf, + bool compressed, size_t size, struct pstore_info *psi); int (*erase)(enum pstore_type_id type, u64 id, int count, struct timespec time, struct pstore_info *psi); diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h index 712757f320a4..45ac5a0d29ee 100644 --- a/include/linux/pstore_ram.h +++ b/include/linux/pstore_ram.h @@ -17,11 +17,12 @@ #ifndef __LINUX_PSTORE_RAM_H__ #define __LINUX_PSTORE_RAM_H__ +#include <linux/compiler.h> #include <linux/device.h> +#include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/types.h> -#include <linux/init.h> struct persistent_ram_buffer; struct rs_control; @@ -59,7 +60,9 @@ void persistent_ram_free(struct persistent_ram_zone *prz); void persistent_ram_zap(struct persistent_ram_zone *prz); int persistent_ram_write(struct persistent_ram_zone *prz, const void *s, - unsigned int count); + unsigned int count); +int persistent_ram_write_user(struct persistent_ram_zone *prz, + const void __user *s, unsigned int count); void persistent_ram_save_old(struct persistent_ram_zone *prz); size_t persistent_ram_old_size(struct persistent_ram_zone *prz); |